Mobile CSS: right-align navbar title

The flex navbar's single .container has no fixed width on mobile, so it shrinks to
the title's width and its auto margins center it — centering 'David A. Windham'.
Force .navbar .container to full width below 768px so float:right pins the title to
the right edge, matching desktop.

style.css

@@ -1706,6 +1706,13 @@ h2.entry-title {
 		padding-left: 15px;
 		padding-right: 15px;
 	}
+	/* The flex navbar's single .container has no fixed width on mobile, so as a
+	   flex item it shrinks to the title's width and its auto margins center it —
+	   which centers "David A. Windham". Force full width so float:right pins the
+	   title to the right edge, matching desktop. */
+	.navbar .container {
+		width: 100%;
+	}
 }
 /* Block templates (search / 404 / page.html): the navbar's site-title is
    float:right, so it collapses the header and block <main> content would ride up